# Custom sources
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For custom application logs, you can define your own data source categorization using one of the following methods:
+ **Log group tags** – Add tags to your log groups using the keys `cw:datasource:name` and `cw:datasource:type` to specify the data source name and type for all logs ingested in the log group.
+ **Pipeline configuration** – Configure data source information through log processing pipelines when ingesting your application logs.

**Note**  
Custom data source names cannot start with "aws" or "amazon" to avoid conflicts with AWS service logs.